#include<bits/stdc++.h>
using namespace std;
int main()
{
	cin.tie(0);
	cout.tie(0);
	ios::sync_with_stdio(0);
	int x,y;cin>>x>>y;
	double yuan=100*50;
	double s1=x*y/2;
	double s2=(100-x)*(100-y)/2;
	cout<<yuan-s1-s2-(100-x)*y;
	return 0;
}